The sun shimmers across the glassy surface of Blue Hole, a heart-shaped underwater sinkhole, as two divers prepare to descend into its treacherous, turquoise abyss. In this part of the ocean, known as ...

GUAM — Only a scattering of light penetrates the deep water, more than 300 feet beneath the ocean surface off the coast of Guam. It's like twilight to the human eye, even in the middle of the day.

Diving to the ocean’s upper twilight zone is a treacherous endeavor. Standard gear simply doesn’t cut it at these depths — recreational divers breathing compressed air don’t venture below 130 feet.

This zone contains a vast amount of marine life, potentially over 90% of all ocean life, and supports important commercial and recreational fisheries. Creatures in the twilight zone help mitigate ...

Between 1,000 and 4,000 metres deep, there isn’t any sunlight at all so creatures find new strategies to survive ...

(CNN) — Only a scattering of light penetrates the deep water, more than 300 feet beneath the ocean surface off the coast of Guam. It’s like twilight to the human eye, even in the middle of the day.

...FLOOD WATCH REMAINS IN EFFECT FOR ALL HAWAIIAN ISLANDS... * WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...all Hawaiian Islands. * WHEN ...